问题
The university estimates that living expenses for international students _________ around $8,450 per year, which _________ a burden for some of them.
A:are is
B:is are
C:is is
D:are are
B:is are
C:is is
D:are are
正确答案是：
同类题型
Look! There are many in the sky. I think it will be tomorrow.
So suddenly ________ that people had no time to escape. [ ]
I had just started back for the house to change my clothes _____I heard my name called[ ]
your doctor’s advice or your cold will get worse．
Things lost sometimes just turnup________you never expect to find them.